A conversion tracking link in SFMC is a URL that measures whether email recipients complete specific goals after clicking through from your campaign. When you set up conversion tracking in Email Studio, SFMC appends a unique tracking parameter to your links that connects subscriber clicks to downstream actions like purchases, sign-ups, or downloads. The system then attributes those conversions back to the original email send, journey, or automation. SFMC stores conversion data for 90 days by default and lets you define conversion activities either through web analytics tracking code on your landing pages or through imported conversion data matched by subscriber key or email address. You configure tracking at the account level under Setup > Tracking, where you specify which actions count as conversions and assign conversion values if you want ROI reporting. The key limitation is that SFMC's native conversion tracking relies on cookies and tracking pixels, so it breaks when users clear cookies, switch devices, or have privacy tools enabled. Conversion attribution typically ranges from 60-75% accuracy depending on your audience's privacy settings and browsing behavior. Most e-commerce clients we work with see better results integrating SFMC with Google Analytics or their order management system directly, then importing conversion data back into SFMC using subscriber key as the match point. For accurate tracking, your destination pages need SFMC's tracking code installed, or you need to build a server-side integration that posts conversion events back to SFMC's API. The web analytics connector pulls data from Google Analytics or Adobe Analytics automatically if configured correctly, which saves development time but adds 24-48 hour reporting lag. At Ottawa SEO, when clients run SFMC email campaigns tied to revenue goals, we typically set up dual tracking: SFMC's native conversion links for in-platform reporting plus UTM parameters for Google Analytics verification. That gives marketing teams the quick SFMC dashboard view while maintaining a reliable cross-channel truth in GA4 that accounts for multi-touch attribution.